impelmentation of windowing a signal with very high overlap percentage

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I am trying to manually implement stft,but i wanted to implement in such a way that the overlap of window is so large i mean to say if the window length is from 1 to 98 samples my overlap should be from 2nd sample to 99 samples i have created a code with using the basic functions not even considering the fft function of matlab also my algorithm was to calculate the fft of the windowed signal manually and later slide the window by deleting the 1st sample and then adding the 99th sample in my case. this is the code i have designed so far please help me from here as i have no idea from here.

      fs = 5000;
      t = (0:100)/fs;
      omega1 = 2*pi*500;
      w = hamming(98)';%window with length of 98
      x = sin(omega1*t);%signal
      e = length(x);
      y = x(1:98).*w;% windowed signal
      T = length(y);
      N = length(y);
      freq = (0:N-1)*fs/N;%frequency axis
      output = zeros(size(x));
        for k = 0:N-1 
            s = 0;
        for n = 0 : N-1
            s = s + x(n + 1).*w(n+1) .*exp(-2i * pi * n * k / N);%fft performed with windowing
            Stotal = s - x(n+1)*exp(-2i * pi * n * 0 / N);%I have subtracted the 1st sample 
        end
          output(k+1 ) = Stotal;
        end