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String: replace()

The replace method replaces a substring with another:
var str = 'JavaScript';
var newstr = str.replace('Java', 'ECMA');
'Java' is replaced with 'ECMA'. Thus newstr has the value 'ECMAScript'. The original string remains unchanged. Only the first occurrence is replaced:
var newstr = 'Dada'.replace('a', 'i');
newstr has the value 'Dida' and not 'Didi'.


Write a function normalize, that replaces '-' with '/' in a date string. normalize('20-05-2017') should return '20/05/2017'.