Deleting substrings

A function which takes a string and a substring as input and which
deletes the substring in the main string.
Eg: mainstr=abcxyghixy sub=xy
Result should be mainstr=abcghi.

Will it require recursion ?

How to handle the deletion part..I mean deleting a substring and then
starting all over again looking for the next substring.

.

Relevant Pages

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