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→{{header|C}}: code
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</pre>
===shortest substring===
<lang c>
// strstr : Returns a pointer to the first occurrence of str2 in str1, or a null pointer if str2 is not part of str1.
// size_t is an unsigned integer typ
// lokks for the shortest substring
int repstr(char *str)
{
if (!str) return 0; // if empty input
size_t sl = 1;
size_t sl_max = strlen(str) ;
while (sl < sl_max) {
if (strstr(str, str + sl) == str) // How it works ???? It checks the whole string str
return sl;
++sl;
}
return 0;
}
</lang>
=={{header|C++}}==
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