replace header file string

i have a data in variable "V" (fms_fast is the data in variable 'v'). i have a header file and i have attached it below.
i have to replace the string @seq_name@ in the header file with the data in the variable (v)..
please help me with this
Code:
/** \file msel_@seq_name@.h
 *
 * DO NOT EDIT - THIS FILE IS AUTOMATICALLY GENERATED BY MSEQ CODE GENERATOR !
 *
 * %PCMS_HEADER_SUBSTITUTION_START:%
 * <table border="0" cellspacing="0" cellpadding="0">
 * <tr> <td> Source:   </td> <td> %PM: msel_@seq_name@.h %
 *                                                                 </td></tr>
 * <tr> <td> Revision: </td> <td> %PR: 1.00 %                      </td></tr>
 * <tr> <td> Status:   </td> <td> %PS: UNDER_REVIEW %              </td></tr>
 * <tr> <td> Author:   </td> <td> Hans-Joerg Boehme                </td></tr>
 * <tr> <td> Date:     </td> <td> %PUDT: 03-AUG-2017 11:22:48 %    </td></tr>
 * </table>
 * %PCMS_HEADER_SUBSTITUTION_END:%
 * \n
 * <table border="0" cellspacing="0" cellpadding="0">
 * <tr> <td> COMPONENT: </td> <td> MSEQ: Measurement Sequences     </td></tr>
 * <tr> <td> SCOPE:     </td> <td> Public                          </td></tr>
 * <tr> <td> TARGET:    </td> <td> Freescale MPC, Renesas RH850    </td></tr>
 * </table>
 */
 
#ifndef I_MSEL_@SEQ_NAME@_H
#define I_MSEL_@SEQ_NAME@_H
 
/*********************************************************************************************************************/
/*                Include common and project definition header                                                       */
/*********************************************************************************************************************/
#include "dstdint.h"            /* Standard definitions                                                              */
#include "dassert.h"            /* Standard definitions                                                              */
#include "dstdbool.h"           /* Standard definitions                                                              */
#include "dstring.h"            /* Standard definitions                                                              */
 
#include "tmp_pdf.h"            /* Project definitions                                                               */
 
/*********************************************************************************************************************/
/*                      Include headers of the component library                                                     */
/*********************************************************************************************************************/
#include "msel.h"               /* MSEQ sequence library interface template                                          */
 
/*********************************************************************************************************************/
/*                            Include other headers                                                                  */
/*********************************************************************************************************************/
 
#ifdef __cplusplus
extern "C" {
#endif
 
/*********************************************************************************************************************/
/*                 Definition of exported symbolic constants                                                         */
/*********************************************************************************************************************/
 
/*********************************************************************************************************************/
/* * code generator defined constants                                                                                */
/*********************************************************************************************************************/
/*********************************************************************************************************************/
/* * sequence type name definition                                                                                   */
/*********************************************************************************************************************/
#define MSEL_@SEQ_NAME@
 
/*********************************************************************************************************************/
/*                Definition of exported function like macros                                                        */
/*********************************************************************************************************************/
 
/*********************************************************************************************************************/
/*         Definition of exported types (typedef, enum, struct, union)                                               */
/*********************************************************************************************************************/
 
/*********************************************************************************************************************/
/*                    Declaration of exported variables                                                              */
/*********************************************************************************************************************/
 
/*********************************************************************************************************************/
/*                  Declaration of exported constant data                                                            */
/*********************************************************************************************************************/
extern const struct MSEL_meas_seq_S  MSEL_meas_seq_@seq_name@;
 
/*********************************************************************************************************************/
/*               Declaration of exported function prototypes                                                         */
/*********************************************************************************************************************/
 
#ifdef __cplusplus
}
#endif
 
#endif  /* I_MSEL_ @SEQ_NAME@ _H */