diff --git a/src/markov-chain/main.jl b/src/markov-chain/main.jl
deleted file mode 100644
index 37467be..0000000
--- a/src/markov-chain/main.jl
+++ /dev/null
@@ -1,42 +0,0 @@
-## main file for Markov chain related structs and functions
-
-
-"Check if all the probabilities are greater equal than 0."
-function check_prob(mat_prob::Union{Array{Float64,2}, Array{Int64,1}})
-    if all(mat_prob .<= 0)
-        throw("All probabilities must be greater equal than 0.")
-    end
-end
-
-
-"Check if all the summations of rows in stpm are 1."
-function check_prob_sum(stpm::Array{Float64,2})
-    n_row = size(stpm)[1]
-    if all(stpm * ones(n_row, 1) .== 1)
-        throw("The sum of probabilities in $i-th row doesn't equal to 1.")
-    end
-end
-
-
-"Calculate limiting probability distribution of a Markov chain family."
-function cal_vec_lpd(stpm::Array{Float64,2})
-
-    hcat([1; 1; 1])
-    return vec_lpd
-end
-
-
-"Define the non-mutable struct for Markov chain family."
-struct MarkovChainFamily
-    stpm::Array{Float64,2}  # [Stationary Transition Probability Matrix]
-    vec_lpd::Array{Float64,2}  # [Limiting Probability Distribution]
-
-    function MarkovChainFamily(stpm::Array{Float64,2})
-        check_prob(stpm)
-        check_prob_sum(stpm)
-
-        vec_lpd = cal_vec_lpd(stpm)
-
-        new(stpm, vec_lpd)
-    end
-end