Question: In C language: (1)Using Design by Contract, update the following to be robust and reliable char * concat( const char * s1, const char *

In C language:

(1)Using Design by Contract, update the following to be robust and reliable

char * concat( const char * s1, const char * s2 ) {

char * result = malloc( strlen( s1 ) + strlen( s2 ) + 1);

strcpy( result, s1 );

strcat( result, s2 );

return result; // caller has to free later

}

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