Given a string that represents a mathematical expression operating on one-digit integers, compute the result

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    The result must be with floating point precision. Ensure that your solution follows the order of operations.
    Example inputs and outputs are:
    input: "2", output: 2.0
    input: "2+2" output: 4.0
    input: "2*2+1", output: 5.0
    input: "1+3*5", output: 16.0
    input: "1+3*6+3*2+1", output: 26.0
    input "3-5*2", output: -7.0
    input "3-5*2/3+1", output: 0.6667

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    No parentheses? LeetCode's Basic Calculator II:

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