"C" string substitution space: Implement a function to replace the space in the string with "%20"

String substitution spaces: Implements a function that replaces spaces in a string with "%20" #include <stdio.h> #include <assert.h>void replace (char *src) {assert ( SRC); int oldlen = 0;                  Original string length int newlen = 0;                  New string length int blacknum = 0;                Number of spaces int newback = 0;                 New string Trailing int oldback = 0;                 The original string trailing while (Src[oldlen]! = ' + ') {if (Src[oldlen] = = ') {blacknum++;} oldlen++;} Newlen = Oldlen + blacknum * 2;oldback = OldLen-1; Newback = Newlen-1;while (oldback!=0) {if (src[oldback] = = ') {src[newback--] = ' 0 '; src[newback--] = ' 2 '; src[newback] = '%';} Else{src[newback] = Src[oldback];} oldback--; newback--;}} int main () {char p[20] = "Hello world!"; Replace (p);p rintf ("%s\n", p); return 0;return 0;}

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"C" string substitution space: Implement a function to replace the space in the string with "%20"