Strcmp Problem Segmantation Fault insert method not working

I used GDB, and realised that the problem was reaching these line of codes:

in main:

'''

    else if(strcmp("insert",arg[1])==0){    insert("a.txt","Cem","Mec","Cem","-a");}

'''insert method:

'''

void insert(char *filename, char *insertedWord, char *searchedWord,char *oldsearchedWord, char *ab){

if(strcmp("-a",ab) == 0){    strcat(searchedWord,"");    strcat(searchedWord, insertedWord);    replace(filename,searchedWord,oldsearchedWord); }else if(strcmp("-b",ab) == 0){    strcat(insertedWord,"");    strcat(insertedWord, searchedWord);    replace(filename,insertedWord,oldsearchedWord);}

}'''

and the error is:

Program received signal SIGSEGV, Segmentation fault.__strcmp_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:3232 ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S: No such file or directory.

I checked my replace method. It works.