char *add_string(char array_1[],char array_2[]);char *add_string(char array_1[],char array_2[]){ char *result=NULL; int len_1,len_2; len_1=strlen(array_1); len_2=strlen(array_2); result=(char *)malloc((len_1+len_2+1)*(sizeof (char ))); strcpy(result,array_1); ...