Your input variable is a cell array. Each string is an element in that cell array and so length reports 2, because you have 2 elements. If you do length(string(1)) then you still try to access the cell element itself rather than its content. However, if you do length(string{1}) then this should actually report the length of the first string, because using curly bracket you can access the content of a cell. If you search the documentation for "cell array" you will find more details on this.
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