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def is_substring_present(main_string, substring):
main_len = len(main_string)
sub_len = len(substring)
for i in range(main_len - sub_len + 1):
if main_string[i:i + sub_len] == substring:
return True
return False
# Example usage
main_string = "Hello, World!"
substring1 = "World"
substring2 = "Python"
if is_substring_present(main_string, substring1):
print(f"'{substring1}' is present in '{main_string}'")
else:
print(f"'{substring1}' is not present in '{main_string}'")
if is_substring_present(main_string, substring2):
print(f"'{substring2}' is present in '{main_string}'")
else:
print(f"'{substring2}' is not present in '{main_string}'")
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